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usb mass storage sample for at91sam7s256 prevent computer to load

meysam nabi

Hi my friends!

I've implemented keil sample code for usb mass storage on my board that is designed base on Atmel AT91SAM7S256, chip.(keil\arm\boards\atmel\at91sam7s-ek\usb\memory\)

I tested it on 10 computer so :
-in windows there is no problem and all computers recognize it and work correctly.

but:
in three of them when my board is attached to, and I restart computers, my board prevent them to loading and those computers stop in primary steps of loading before load of windows.

in this state if I detach board from computer, loading continues and windows will be start.

I tested this problem with HID sample but there is no problem with Hid sample.

first priority for boot in these computers is ture, and there is no usb device in boot list in bios for this.

Can anyone help me??

thanks for your attention.

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